Improvement in apparatus for boring or broaching



J. J. LOVE. Apparatusrfor Boring or Broaohing.

Ne. 200,071.. Patented Feb. 5,1878.

N. PETERS, PHOTaLHHDGRAPHER. wASm-NGTON. D C,

UNITED STATES PATENT OEEIOE.

JOHN J. LOVE, OE NEwYOEK, N. Y.

IMPROVEMENT lN APP'ARATUS FOR BORING OR BROACHING.

Specification forming part of Letters Patent No. 200,071, dated February 5, 1378; application filed August 13, 1877.

To all whom it may concern:

Be it known that I, JOHN J. LOVE, of the city, county, and State of New York, have invented cert-ain new and useful Improvements in Apparatus for Boring or Broaching, of which the following is a description:

My improvements relate particularly to machinery employed in broaching, dressing, or

borin g cylinders for steam-en gines, pumps, Sto.

In embodying these improvements in machinery, for the purpose first mentioned, I support the shaft carrying the cutters in bearings, having a slotted connection with headpieces fastened to the cylinder to be operated upon, whereby said shaft may be readily attached to, adjusted in, and detached from the cylinder. I support the shaft in a bearing receiving an adjustable journal provided with flanges overlapping said bearing, whereby the shaft may be supported close to the end of the cylinder, and will be precluded from shifting longitudinally.

I operate the cutter-head with its cutters longitudinally along the cylinder by a screw shaft or worm operating upon a nut made externally taper, so as to wedge in the cutter-head, or a sleeve on which it is mounted, and compensate for wear or differences in size, and impart a steady motion to the cutters. I impart motion to the cutter-shaft through a worm and worm-wheel, as usual; but I drive the worm by a combination of gearing producing great Y power. I drive the screw-shaft for moving the cutters lengthwise of the cylinder by a gear-wheel, which derives motion by revolving around a gear-wheel which has but a limited movement as the said shaft rotates on its axis, and I insert the cutters in mortised arms provided with longitudinal slots, and secure vthem with bolts.

In the accompanying drawings, Figure l is a side view of an apparatus embodying my invention, certain parts being shown in section, and a central longitudinal section of a cylinder 'being represented in dotted outline. Fig.

one of the connections between the cylinder, one end of which is here represented in dotted outline, and the bearing for the shaft attached to that end of the cylinder.

Similar letters of reference designate correspondin g parts in all the iigures.

A designates a cylinder, which I have shown in dotted outline because, of itself, it forms no part of my invention. B designates a rotary shaft, which is shown as supported from the said cylinder, and on which is mounted a movable cutter-head, C, carrying cutters D for ,broachin g or dressing the cylinder, or for boring77 it, as this work is more commonly termed. This shaft is shown as supported in bearings E E', which are shown as sustained by the cylinder A. The bearing E is shown as fastened directly to the adjacent iange of the cylinder A by bolts or screws a passing through slots b, blocks F being interposed between this bearing and said Vflange to throw it far enough outside of the cylinder to accommodate the hub of the movable cutter-head C, and admit of the cutters operating upon the cylinder to its extreme end. The bearing E', however, is shown as fastened by bolts o to head-pieces G, secured by bolts d to the other iiange of the cylinder A, so as to allow the hub of the movable cutter-head C to extend so far outside of the cylinder that the cutters D may operate on the cylinder at the adjacent end.

Preferably the bolts c, securing this bearing E to the head-pieces G, pass through slots e in the head-pieces, and through slots f in the bearings extending perpendicularly to the former, in Order to provide for the adjustment of the shaft B vertically or horizontally, or both vertically and horizontally, tocause'the cutters D to operate properly within the cylinder A. The slots bin the bearingsE also afford provision for this adjustment. served that the shaft is not provided with fixed journals litting in these bearings E E', but `it is furnished with journals consisting of sleeves H, which are provided with ianges overlapping the bearings, and which are ysecured to the shaft B, so .as to rotate with it, by splines I, tapering like keys, and ittin g in a groove, g, in said shaft, andtherefore that, no matter how long or short the cylinder to be broached, dressed, or bored may be, the

n win be 0bdressed, or bored.

' bearings and journals maybe adjusted on the shaft to support itclose to the endsof the cylinder. This combination of journals and bearings is very advantageous, for it enables the shaft to be supportedV with the greatest Y steadiness, whereas the cutter-carrying shaft Y of ordinary apparatus for broaehin g, linishin g, or boring cylinders havin g iixed journalshas, Y Y in broachin g, dressing, or boring a short cylin- Y der, to Ybe supported at such a great VdistanceV from one end thereof as to be very unsteady, which is, of course, exceedingly detrimental to the work performed in the cylinder;

The movable cutter-head C is mounted on a sleeve, Y, furnished with'a spline, J, tting bolts or screws J, passing transversely through.V

them and through longitudinal slots in the said armsh, being employed to clamp and hold them in place in any suitable position. The means for moving the cutter-head C,

Y i with Vits Vcutters l), longitudinally alongl the shaft B during their rotary movement requiresV particular description.

K designates a screw-threaded shaft or worm, (shown as supported bybearings 7c in aV groove, L) Vextendin g longitudinally along the Y said shaft B, and driven, preferably,by mechanism which I will describe hereinafter. L Y

designates a nut arranged in the sleeve Y of the movable Vcutter-head O, which tapers eX- ternally from the end, like a key, whereby, as soon as lon gitudinal-motion of the cutter-head, operating worm or screw serves to tighten this nut in the sleeve of the cutter-head, all play between it and the sleeve incident to wear or difference in sizes is compensated for, and the cutters steadied and moved longitudinally along the cylinder, so as to operate uniformly on the cylinder, and avoid all jumpingor other jerky and irregular movements, which tend to impair the quality of work thereon.

.Although the screw shaft or worm K may be operated in different ways, I prefer to operate it by means which I will now describe.

M designates a gearwheel, which is mounted on one end of the said screw-shaft or worm. (See particularly Fig. 3.) N designates a gearwheel, which is supported on a stud extending from the shaft B, and engages with the gear-wheel M and O designates a gear-wheel, also mounted on a stud extending from the shaft B, and which has attached to it a lever, I), fastened at the outer end by a cord or other device, so as to limit the mot-ion of the wheel during the rotationl of the shaft B. The wheel O being limited in its motion, the gearwheels M N are carried around it. The gearwheel N derives mot-ion from thel wheel 0,

andV transmits it to the gear-wheel M, and. :thence Vto theworm or screw K, moving the cutters through'the cylinder with great uni-V formity.

I It'is'obviou's that Vif the gear-wheel'N should be limited in its movements, insteadV of the gear-wheelV O, the screw-shaft or worm maybe made to operate Vcutters along the cylinder with a reverse lon gitudinal movement, but otherwise with the Vsame advantages, and that Vin this way a change in theV feed of the cutters may be easily effected without any reversal of the main driving mechanism. Turning, now, to this main driving mechanism, @designates a worm-gear wheel mounted on the shaft B,

so'asto impart rotary motion thereto. Y R des- Y ignates a screw or worm, shown as supported 'fromY the bearing E, and driving the wormgear wheel'Q.V Sldesignatesa large gear-V wheel arranged on saidV wormorscrew R. I designatesa pinion or small gear-wheel mounted on a shaft, U, driving the gearwheel S, and the screw or worm R, carrying the latter. Y yf-designates a large gear-wheel Von the opposite end of the shaft U, and XYVV designates a pinion or small gear-wheel, it- Y ting looselyV onthe screw-shaft B, drivin gthe Vlarge gear-wheel V, and through its appurte-V Y nances the screw or worm It and shaft B, and deriving motion from the pulley-X, driven by a belt or otherwise.

This combination of gears enables broachingyclressing, or boringapparatus with` a Y Y Y small amount of power to be operated withV sufficient-energy for its work.

ItV will haveV been-seen that by my inven-V tion I provide for adjusting the cutters of apparatus for breaching, dressing, or boring cylinders properly within the cylinders to be op erated upon; that I provide for supporting the main shaft of said apparatus close to the cylinder to be operated on, no matter how long or short it may be; that I provide for easily adjusting the cutters; that I provide for moving the cutters longitudinally within the cylinder with a very uniform and regular motion; that I provide for operating the worm, imparting longitudinal motion to the cutter-head and cutters with great uniformity and regularity; and that I provide for effect` ing the operation of the cutters with sufficient energy with a small amount of power.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination, with the shaft B, frame E for said shaft, and the driving mechanism therefor, of the rectangular head-pieces G, to be secured to the ends of a cylinder to be operated upon, said head-pieces being slotted in one direction, and said frame being slotted reversely at its points of connection with said head-pieces, substantially as described, whereby the said shaft and its driving mechanism may be readily attached to, adjusted in, and detached from a cylinder operated upon.

2. In an apparatus for broaching, dressing,

yor boring cylinders, the combination of a main shaft provided with a longitudinal groove, an adjustable journal, a key for locking said journalin different positions, so as to turn with the said shaft, and flanges extending from the ends of said journal and overlapping the bearing in which it ts, substantially as speciiied, whereby longitudinal motion of the shaft is obviated.

3. The combination, with a screw-shaft 0r worm, of an apparatus for broaching, dressing, or boring cylinders, and the cutter-head or sleeve, which it moves longitudinally through a cylinder, subjected to the action' of its cutters, of a nut tapering externally lengthwise, 

